She said your verbal communications can also make or break your
relationship with your boss, team, clients, business partners,
and your industry network - and explained that if you use
language that dumbs you down, you may be misunderstood by those
around you at work, which can significantly hurt your chances of
advancing and succeeding.

Shortly after publishing the list, Taylor shared 15 more words
and phrases that make you sound dumb. Keep scrolling to see if
they're ones you're using.

source

Thomson Reuters

'Chill out'

First of all, you almost never want to tell your boss or
colleague to "relax" or "calm down" because nobody
likes hearing that. But if you're going to do it, don't use the
phrase "chill out." It's just obnoxious and unprofessional.

'OMG, shut up!' or 'No, stop it!'

You never want to use this to tell someone to be quiet at
work - but that's not even what we're talking about
here.

If you're genuinely surprised or excited by something at
work, there are better ways to express your those feelings than
saying something dumb like, "Shut up?!?!"

Instead try, "Wow, that's great!" or "I'm so thrilled
about this opportunity!"

'For sure'

How about, "yes?" The phrase "for sure" will make you sound
immature and, well, kind of dumb.

'Booyah'

It's great to be happy at work. But when you're particularly
excited or proud of something, don't yell out "booyah!" It's
annoying for so many reasons.

source

Movieclips/YouTube

'Dude,' 'man,' or 'bro'

No, no, no.

Don't refer to your male colleagues as "dude" or "man" or
worst of all, "bro." Just ... don't.

'Chicks' or 'girls'

The same goes for "chicks." It's highly offensive and
inappropriate, even if you're a woman referring to other women
this way.

'Whattup?' or 'sup?'

Stop with the slang. You're not a teenager instant messaging your
BFF on AIM.

'Um' or 'uh'

We understand that you sometimes use these as filler words when
you're nervous, and you may feel like you can't control the
number of "ums" and "uhs" you use on a daily basis, but you can!